@MarkusRietzler: "<quote>
one more question: in squid.conf i can set "keep_alive off" (also for
ntlm_auth).
if keep-alive is a must for NTLM challenge response, then what
"keep_alive off" means? 
that would contractict the "must"...???
markus"
    @MarkusRietzler: "<quote>
so seems that we have no chance to find a workaround. one (minor)
problem is, that we have written the acls in that way, that squid will
try NTLM Auth and makes no fall back to ntlm via basic auth. this way we
prevent that users will have many auth dialogs when they only are
allowed to access "open" websites. that also includes ad banners on
"open" sites...
so this means, that if NTLM auth failed no basic auth is done. basic
auth only comes up if the client does not support NTLM.
it works with HTTP but not with HTTPS. so it really seems to be an issue
with Java. the faqs say that it (should) work with java 1.4.2 and up...
seems that we have no real chance to solve this...
maybe we can "open" jnlp-urls, so that no auth is required... but this
looks like a cheap trick...
markus"
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